Ford: 87 Aerostar A/C

Ben wrote: 
probably the same problem i am having with a 93 taurus.. the signal to
the compressor clutch is sometimes not working.. on mine it gets
electrcitiy( 12 volts to the relay(integrated control relay) and it does
not come out with voltage, what controls this is the throttle valve
sensor, might need a new on but check it out first... or someother
sensor that is telling the relay to not operate as the car is either
wide open throttle, too hot, or something else.... like mine its not the
charge as when it works its ice cold, but i do find that by giving it a
little gas with the foot the a/c works almost all the time.. i changed
out all my sensors, will then go into the int. control relay and check
that out....

You're not getting enough airflow thru your condenser, the radiator in
front of the engine's radiator. Maybe insects, maybe cooling fan. It
could also be low refrigerant or "twitchy" low pressure switch.

Ben wrote: 

Are you suggesting that a 1987 vehicle has a high-pressure cutoff switch?
(Which would be the only reason the compressor would be turning on and off
due to clogged airflow through the condenser). Clogged airflow through the
condenser would raise system pressure, which (I believe) systems of this era
isn't even monitor. (R-12 system)

Has this vehicle been legally converted to r-134a (a high-pressure cutoff
switch will have been installed if so)?

How do you know the system is full?

IF the idle is going up and down, then I"m assuming the computer is not
turning the compressor on and off (or it would also adjust the idle as well,
and the idle wouldn't go up and down).

Perhaps it is a loose connection at the compressor? Something that is
causing the voltage to the clutch coil to be intermittent. Perhaps at higher
speeds you don't notice it as much because the compressor does more work
while it is on and the engine is turning it faster.


"Sharon K. Cooke" <net> wrote in message
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off 

The A/C has been doing this for several years, and the solution I found was
to increase the RPM to 1000, by opening the trotle with the adjusting screw,
but then when I'm not using the A/C, the idle is to hight.
There is no intermitent wiring or anything, the airflow is good and it does
it all the time ( just turned on, or after awhile),
I hear the A/C relay clicking everytime is going on/off, but one thing I
don't know is what control this relay? is it the computer or something else?
and if it does it at low RPM ( 800 ) what is the correct RPM setting with
the A/C on? I was thinking in bypassing the A/C relay and install a
thermostat ( like in the old times A/C), but then when I need the extra
power like in full trotle, it won't disconect.
Any sugestions?

Ben

"Clem" <com> wrote in message
news:supernews.com... 
the 
era 
well, 
higher 
compressor 
5